Mathematics
Determine the A.P. whose 3rd term is 16 and the 7th term exceeds the 5th term by 12.
AP
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Answer
Given,
⇒ a3 = 16
⇒ a + (3 - 1)d = 16
⇒ a + 2d = 16 ………(i)
Given,
⇒ a7 - a5 = 12
⇒ [a + (7 - 1)d] - [a + (5 - 1)d] = 12
⇒ (a + 6d) - (a + 4d) = 12
⇒ a - a + 6d - 4d = 12
⇒ 2d = 12
⇒ d = 6.
Substituting value of d in (i) we get,
⇒ a + 2(6) = 16
⇒ a + 12 = 16
⇒ a = 4.
A.P. = a, (a + d), (a + 2d), ……….
= 4, (4 + 6), (4 + 2(6)), ………
= 4, 10, 16, ………
Hence, A.P. = 4, 10, 16, ………
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